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M.Mosa 대한설비공학회 2019 International Journal Of Air-Conditioning and Refr Vol.27 No.3
Absorber is the most important component in LiBr-H2O absorption systems as its operating performance directly influences the performance of the whole system. In simulating absorption heat and mass transfer in horizontal tube absorber, many authors, for simplicity, make some assumptions. One of these assumptions is that the thermo-physical properties of the solution are constant across the absorber. In this paper, LiBr-H2O horizontal tube absorber was simulated with constant and variable thermo-physical properties and a comparison between the performance parameters (solution concentration, solution temperature, absorber heat duty and rate of vapor absorption) was made. Two solution flow rates are used in this simulation (Γ=0.0375 kgs −1 m −1 and Γ=0.025 Γ=0.025kgs −1 m −1) and a computer program was developed to simulate the two cases (constant and variable thermo-physical properties). The comparison results show that, in case of variable thermo-physical properties, the heat duty and vapor absorption rate are less than those in case of constant thermo-physical properties whereas solution concentration and temperature are slightly greater. Also, it is found that increasing solution volume flow rate increases the difference in heat duty and absorption rate and slightly decreases the difference in solution concentration and temperature.
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하수슬러지 슬래그를 이용한 다공성 세라믹스 흡음재료 제조
신대용,한상목 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.3
다공질 세라믹스 흡음재료의 흡음특성과 물리.기계적 특성에 미치는 하수슬러지 슬래그 첨가량과 입경 효과에 대하여 조사하였다. 시편의 물리.기계적 특성은 슬래그 입경과 관계 없이 소성온도가 증가하고 슬래그 함량이 감소함에 따라 증가하였으며, 슬래그의 함량이 일정한 시편은 물유리 첨가량이 증가하고 슬래그 입경이 감소함에 따라 증가하였다. 1~3mm 크기의 슬래그를 약 77~89 wt% 함유하고 1,05$0^{\circ}C$에서 2시간 소성한 시편의 부피비중은 1.48~1.71, 압축강도 85~163 kgf/$\textrm{cm}^2$을 나타내었으며, 1~3mm의 슬래그를 이용한 시편은 저주파영역, 슬래그 입경이 1 mm이하인 시편은 고주파영역의 흡음특성이 향상되었으며, 시편의 두께가 증가함에 따라 저주파영역의 흡음특성이 향상되었다. The effects of content and particle size of sewage sludge slag on the sound absorption was investigated and the physical$.$mechanical properties of porous ceramics for sound absorbent material was studied. The physical$.$mechanical properties of specimens have depended on sintering temperature and slag content without particle size effect of slag. As water glass content increase and particle size of slag decrease at the same slag content, physical$.$mechanical properties of them have been improved. The bulk density and compressive strength of specimens with the batch composition of 77∼89 wt% of slag content and particles with 1∼3 mm, and sintered at 1,050$^{\circ}C$ for 2 h were 1.48∼1.71 and 86∼163 kgf/$\textrm{cm}^2$, respectively. The specimens with 1∼3 mm and <1 mm of particles size showed good sound absorption property at low frequency and high frequency region. With increasing thickness of specimens, sound absorption properties at low frequency region were increased.
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연소전 조건에서 물리흡수제를 이용한 이산화탄소 흡수특성
백근호(Baek, Geun-Ho),유승한(You, Seung-Han),차왕석(Cha, Wang-Seog) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.11
본 논문에서는 주요 온실가스인 이산화탄소를 고압 환원 분위기인 연소전 조건에서 회수하기 위해 물리흡수 제인 DMSO, Sulfone, PEG를 이용하여 이산화탄소 흡수특성을 조사하였다. 회분식 기-액 평형반응기를 이용하여 흡수 반응온도 및 압력에 따른 이산화탄소 용해도와 물리흡수제의 재생성, 그리고 초기흡수특성을 연구하였다. 실험결과 PEG가 이산화탄소 용해도 및 초기 흡수능력이 가장 우수하였다. 그리고 PEG를 비롯한 물리흡수제가 다양한 흡수반 응온도 및 압력에서 우수하게 재생됨을 확인할 수 있었다. In this study, CO₂ absorption properties at high pressure condition that can apply pre-combustion CO₂ capture were investigated for physical sorbent such as PEG, DMSO, and Sulfone. The CO₂ Solubility, regeneration, and initial absorption rate with temperature and pressure were measured using batch type stirred cell contactor. The PEG showed the highest CO₂ solubility and initial absorption rate. It can be found that all the physical sorbents used in this experiments were almost completely regenerated at various temperature and pressure.
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Kim, Dong-Myong,Cha, Eun-Chung The Korean Society of Food Science and Nutrition 2005 Preventive Nutrition and Food Science Vol.10 No.2
Korean medicated diet (KMD) is not a simple combination of food and Chinese drugs, but a special carefully constructed diet made from Sasang constitutional medicines, food and condiments under the theoretical guidance of diet preparation based on differentiation of symptoms and signs of traditional Sasang medicine (TSM). It combines the functional efficacy of medicine with the delicacy of food, and can be used to prevent and cure diseases, build up one's health and prolong one's life. Korean traditional medicated diet has a long history of development. Although influenced by Chinese medicine, Korean traditional medicine has been developed into a unique system of traditional medicine that has surpassed the continental medical practice, sublimating itself into a native medical practice suitable to Korean lifestyles and physical constitutions. In the 19th century, Lee Jema's Sasang medicine (medicine of four types of energy determining the physical constitution) was introduced. It is an integration of mind and body according to the individual's physical constitution that is categorized allowing a customized method of treatment ideal for each category-making the content of Korean traditional medicated diet even richer. The characteristics of Korean medicated diet are as follows: (1) Laying stress on the wole, selecting medicated diet on the basis of differential diagnosis. (2) Suitable for prevention and treatment, outstanding in effect. (3) Good in taste, convenient for taking. KMD refers to drink and food according to certain prescriptions, by processing and cooking that can be used either for prevention and cure of diseases, or for health care and recovery. The purpose of this review is to introduce TSM and KMD based on Sasang constitutional medicines.
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장병욱(Byung-Wook Jang),박선화(Sun-Hwa Park),이원준(Won-Jun Lee),주영식(Young-Sik Joo),박정선(Jung-Sun Park) 한국항공우주학회 2013 韓國航空宇宙學會誌 Vol.41 No.4
항공기 날개 앞전의 레이더흡수구조 최적화를 위한 목적함수를 정의하였으며, 유전체로 구성된 단층형 레이더흡수구조를 설계하였다. 설계변수는 흡수체의 복소유전율이며 반사계수와 레이더반사면적을 각각 목적함수로 사용하였다. 반사계수는 계산이 간단하여 최적화에 효과적으로 사용될 수 있지만 대상물을 평판형태로 가정하기 때문에 구조물의 형상을 충분히 반영하기 어렵다. 반면 레이더반사면적은 형상을 충분히 반영할 수 있지만 계산에 많은 시간이 요구된다. 반사계수는 전송선로이론을 통하여 계산하였으며, 레이더반사면적은 형상조건을 반영하기 위하여 날개 앞전 부분모델에 대해 물리광학법을 사용하여 평가하였다. 최적설계는 유전자알고리즘을 사용하였고, 설계된 레이더흡수구조를 날개 앞전에 적용하여 레이더반사면적을 계산함으로써 레이더흡수 성능을 확인하였다. In this paper, objective functions are defined for optimization of radar absorbing structures(RAS) on the aircraft wing leading edge. RAS is regarded as a single layer structure made of dielectrics. Design variables are the real and imaginary parts of complex permittivity. Reflection coefficient(RC) and radar cross section(RCS) are used in the objective function respectively. Transmission line theory is employed to calculate the RC. The RCS is evaluated by using physical optics(PO) for a leading edge part model. Genetic algorithm(GA) is used to perform optimization procedures. The radar absorbing performance of designed RAS is assessed by the RCS of a wing which has RAS on the leading edge.
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An approach to MgCl2 activation on CdSe thin films for solar cells
S.L. Patel,A. Purohit,S. Chander,M.D. Kannan,M.S. Dhaka 한국물리학회 2018 Current Applied Physics Vol.18 No.7
The energy demand of the world is rapidly increasing and to cater this, there is a need to explore new renewable energy resources. CdSe thin film solar cells may be promising alternative to the CdTe solar cells which are extensively studied and used in solar cell technology. The pre/post deposition chlorine based treatments (viz. CdCl2, MgCl2, NH4Cl) are the important steps to enhance the performance of Cd-based thin film solar cells. Therefore, a study on MgCl2 activation treatment to CdSe thin films for solar cell applications as absorber layer is undertaken. Different physical properties of e-beam evaporated CdSe films (thickness 550 nm) grown on glass and ITO substrates are investigated and found to be strongly dependent on the post-chlorine treatment. The films have cubic zinc-blende structure and phase transformation from cubic (111) to hexagonal (002) is achieved with the MgCl2 treatment while the optical band gap is reduced. I-V characteristics reveal the linear relation between voltage and current as well as the surface roughness is varied with treatment and improved homogeneity. The deposition of CdSe thin films is confirmed by elemental analysis where Cd and Se were found to be rich with treatment. The investigated results suggest that CdSe thin films treated by MgCl2 and annealed at 320 °C may be a viable alternative absorber layer to the Cd-based solar cells.
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Review on Cu2SnS3, Cu3SnS4, and Cu4SnS4 thin films and their photovoltaic performance
Vasudeva Reddy Minnam Reddy,Mohan Reddy Pallavolu,Phaneendra Reddy Guddeti,Sreedevi Gedi,Kishore Kumar Yarragudi Bathal Reddy,Babu Pejjai,김우경,Thulasi Ramakrishna Reddy Kotte,박진호 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
The rapid progress on the Cu–Sn–S (Cu2SnS3, Cu3SnS4, and Cu4SnS4) solar cells has opened a new avenueto generate the electrical energy at ultra-low-cost. Therefore, the progress in the deposition of Cu2SnS3,Cu3SnS4, and Cu4SnS4 thinfilms by various chemical and physical methods is reviewed comprehensively. This article briefly describes (i) the phase diagrams of Cu–Sn–S, (ii) the bulk properties of Cu2SnS3,Cu3SnS4, and Cu4SnS4, (iii) the effect of deposition conditions on the phase formation, (iv) the physicalproperties of Cu2SnS3, Cu3SnS4, and Cu4SnS4 thinfilms, and (v) the photovoltaic performance of Cu2SnS3,Cu3SnS4, and Cu4SnS4 solar cells.
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